JP7018127B2 - A method and device for transmitting and receiving multiple slot-based long PUCCH in a wireless communication system. - Google Patents

Description

The present specification relates to a wireless communication system, and more particularly to a method for transmitting and receiving a multi-slot-based long PUCCH (physical uplink control channel) and a device for supporting the same.

Mobile communication systems have been developed to provide voice services while ensuring user activity. However, mobile communication systems have expanded into data services as well as voice, and are now more developed as explosive increases in traffic cause resource shortages and users demand faster services. Mobile communication system is required.

The requirements for next-generation mobile communication systems are high: explosive data traffic capacity, breakthrough increase in transmission rate per user, significantly increased number of connected devices, and very low end-to-end delay (End- to-End Latency), must be able to support high energy efficiency. For this purpose, Dual Connectivity, Massive MIMO (Massive Multiple Input Multiple Output), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA). Various technologies such as Access, Super wideband support, and Device Networking are being researched.

This specification is a multi-slot long PUCCH (multi-slot) for repeatedly transmitting a long PUCCH based on numerology, slot format indicator, etc. for coverage enhancement. It is an object of the purpose to provide a method of setting a long PUCCH).

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above are to those who have ordinary knowledge in the technical field to which the present invention belongs from the following description. You should be able to understand it clearly.

The present specification provides a method for transmitting a plurality of slot-based long PUCCHs (physical uplink control channels) in a wireless communication system.

More specifically, the method performed by the terminal is used for the step of receiving the first information regarding the TDD (time division duplex) UL (uplink) -DL (downlink) slot setting (connection) from the base station and the transmission of the PUCCH. A step of receiving a second information from the base station, including a first parameter indicating the number of slots to be mounted and a second parameter indicating a PUCCH symbol (symbol) section (duration) in the PUCCH slot, and the first information and the above. A step of determining a slot for transmitting the plurality of slot-based long PUCCHs based on the second information, and a step of transmitting the plurality of slot-based long PUCCHs to the base station on the determined slots. It is characterized by including.

Further, in the present specification, the slots for transmitting the plurality of slot-based long PUCCHs are determined by a specific number of slots from the set start slot.

Also, as used herein, the particular number of slots is characterized by being composed of UL slots or unknown slots.

Also, as used herein, the UL slot is characterized in that the number of UL symbols available for PUCCH transmission in the slot is greater than or equal to the second parameter.

Further, in the present specification, when the number of UL symbols available for PUCCH transmission in the specific slot in the determined slot is smaller than the second parameter, the plurality of slot-based longs on the specific slot. PUCCH is characterized in that it is not transmitted.

Further, in the present specification, the method further comprises a step of receiving a slot format indicator (SFI) for notifying a specific TDD UL-DL slot format from the base station.

Further, in the present specification, the plurality of slot-based long PUCCHs are transmitted using a pre-DFT (discrete Fourier transform) OCC (orthogonal cover code).

Also, as used herein, the plurality of slot-based long PUCCH resources are paired with an OCC associated with a UCI (uplink control information) part and a cyclic shift (CS) associated with a reference signal. It is characterized in that it is determined by (pairing).

Further, in the present specification, a terminal for transmitting a plurality of slot-based long PUCCH (physical uplink control channel) in a wireless communication system includes an RF (Radio Frequency) module for transmitting and receiving radio signals. The RF module includes a processor functionally connected to the RF module, and the processor receives first information about a TDD (time division duplex) UL (uplink) -DL (downlink) slot configuration from a base station. , A second information including a first parameter indicating the number of slots used for PUCCH transmission and a second parameter indicating a PUCCH symbol (symbol) interval (dration) in the PUCCH slot is received from the base station, and the first Based on the information and the second information, a slot for transmitting the plurality of slot-based long PUCCHs is determined, and the plurality of slot-based long PUCCHs are transmitted to the base station on the determined slots. It is characterized in that it is set as follows.

Further, in the present specification, the processor may use the plurality of UL symbols on the specific slot when the number of UL symbols available for PUCCH transmission in the specific slot in the determined slot is smaller than the second parameter. It is characterized in that the slot-based long PUCCH is set so as not to be transmitted.

Further, in the present specification, the processor is set to receive a slot format indicator (SFI) for notifying a specific TDD UL-DL slot format from the base station.

The present specification has the effect that coverage can be extended by transmitting PUCCH using a plurality of slots in a dynamic TDD (Dynamic TDD) situation.

Further, by transmitting the PUCCH to the pre-DFT OCC base, there is an effect that multiple users and a large UCI payload can be supported at the same time.

The effects that can be obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned above should be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs from the following description. Is.

The accompanying drawings included as part of a detailed description to aid an understanding of the invention provide embodiments to the invention and illustrate the technical features of the invention with a detailed description.

It is a figure which shows an example of the overall system structure of NR to which the method proposed in this specification is applicable. The relationship between the uplink frame and the downlink frame is shown in the wireless communication system to which the method proposed in the present specification can be applied. An example of a resource grid supported in a wireless communication system to which the method proposed herein is applicable is shown. An example of a self-controlled subframe structure to which the method proposed herein can be applied is shown. It is a flowchart which shows an example of the operation method of the terminal for transmitting the long PUCCH based on a plurality of slots (multi-slot) proposed in this specification. It is a flowchart which shows an example of the operation method of the base station for receiving the long PUCCH based on a plurality of slots (multi-slot) proposed in this specification. An example is a block configuration diagram of a wireless communication device to which the method proposed in the present specification can be applied. An example is a block configuration diagram of a communication device according to an embodiment of the present invention. It is a figure which shows an example of the RF module of the wireless communication apparatus to which the method proposed in this specification can be applied. It is a figure which shows the other example of the RF module of the wireless communication apparatus to which the method proposed in this specification is applicable.

Hereinafter, the drawings will be described in detail with reference to the drawings to which the preferred embodiments according to the present invention are attached. The detailed description disclosed below along with the accompanying drawings is intended to illustrate exemplary embodiments of the invention and is not intended to indicate the only embodiment in which the invention can be practiced. The following detailed description includes specific details to provide a complete understanding of the invention. However, those skilled in the art will appreciate that the present invention can be practiced without such specific details.

In some cases, known structures and devices may be omitted to avoid obscuring the concepts of the invention, or may be illustrated in block diagram format centered on the core functions of each structure and device.

As used herein, a base station has the meaning of a terminal node of a network that directly communicates with a terminal. In this document, the specific operation described as being performed by the base station may also be performed by the upper node of the base station in some cases. That is, it is self-evident that in a network consisting of a plurality of network nodes including a base station, various operations performed for communication with a terminal can be performed by the base station or other network nodes other than the base station. Is. "Base Station (BS)" is a fixed station (fixed station), Node B, eNB (evolved-NodeB), BTS (base transceiver system), access point (AP: Access Point), gNB (general NB). It can be replaced by terms such as. In addition, the "Terminal" can be fixed or mobile, and can be a UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS ( Subscriber Station), AMS (Advanced Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, etc. Can be replaced.

Hereinafter, the downlink (DL: downlink) means the communication from the base station to the terminal, and the uplink (UL: uplink) means the communication from the terminal to the base station. Downlink, the transmitter can be part of the base station and the receiver can be part of the terminal. On the uplink, the transmitter can be part of the terminal and the receiver can be part of the base station.

The specific terms used in the following description are provided to aid the understanding of the present invention, and the use of such specific terms may be changed to different forms without departing from the technical idea of the present invention.

The following technologies include CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), It can be used for various wireless connection systems such as NOMA (non-orthogonal multiple access). CDMA can be realized by radio technology such as UTRA (universal terrestrial radio access) and CDMA2000. TDMA can be realized by wireless technology such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be realized by wireless technology such as IEEE 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). UTRA is part of UMTS (universal mobile telecommunications system). 3GPP (3rd generation partnership project) LTE (long term evolution) is a part of E-UMTS (evolved UMTS) that uses E-UTRA, adopts OFDMA in the downlink, and SC-FDMA in the uplink. adopt. LTE-A (advanced) is an evolution of 3GPP LTE.

In addition, 5G NR defines eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communications), URLLC (Ultra-Reliable and Low Latency Communications), and V2X (vehicle-to-everything) according to the usage scenario. ..

The 5G NR standard is divided into standalone (SA) and non standalone (NSA) according to the co-existence between the NR system and the LTE system.

And 5G NR supports various subcarrier spacings, CP-OFDM on the downlink, CP-OFDM and DFT-s-OFDM (SC-OFDM) on the uplink.

The embodiments of the present invention are supported by standard documents disclosed in at least one of the wireless connection systems IEEE 802, 3GPP, and 3GPP2. That is, steps or portions of embodiments of the invention that are not described in order to articulate the technical ideas of the invention are supported by the document. In addition, all the terms disclosed in this document can be explained by the standard document.

In order to clarify the explanation, 3GPP LTE / LTE and NR (New Radio) will be mainly described, but the technical features of the present invention are not limited thereto.

Definition of terms

eLTE eNB: eLTE eNB is an evolution of eNB that supports connection to EPC (Evolved Packet Core) and NGC (Next Generation Core).

gNB: A node that supports NR as well as connection with NGC.

New RAN: A radio access network that supports or interacts with the NR or E-UTRA.

Network slice: A network slice is a network defined by an operator to provide an optimized solution for specific market scenarios that require specific requirements along with a range between terminations.

Network function: A network function is a logical node within a network infrastructure that has a well-defined external interface and well-defined functional behavior.

NG-C: A control plane interface used for the NG2 reference point between the new RAN and the NGC.

NG-U: User plane interface used for the NG3 reference point between the new RAN and the NGC.

Non-standalone NR: An arrangement configuration in which the gNB requires the LTE eNB from the EPC as an anchor for control plane connection, or the eLTE eNB from the NGC as an anchor for control plane connection.

Non-independent E-UTRA: An arrangement configuration in which the eLTE eNB requires the NGC to gNB as an anchor for a control plane connection.

User plane gateway: The end point of the NG-U interface.

System in general

FIG. 1 is a diagram showing an example of the overall system structure of NR to which the method proposed herein can be applied.

As shown in FIG. 1, the NG-RAN is a gNB that provides a control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and UE (User Equipment). It is composed.

The gNBs are interconnected through an Xn interface.

Further, the gNB is connected to the NGC through the NG interface.

More specifically, the gNB is connected to the AMF (Access and Mobility Management Function) via the N2 interface and to the UPF (User Plane Function) via the N3 interface.

NR Numerology and frame structure

The NR system can support multiple numerologies. Here, numerology can be defined by subcarrier spacing and CP (Cyclic Prefix) overhead. At this time, the plurality of subcarrier intervals can be derived by scaling the basic subcarrier interval to an integer N (or μ). Also, the numerology used can be selected independently of the frequency band, even if it is assumed that very high carrier frequencies do not utilize very low subcarrier spacing.

In addition, the NR system can support various frame structures that follow multiple numerologies.

The OFDM (Orthogonal Frequency Division Multiplexing) numerology and frame structure that can be considered in the NR system will be described below.

Multiple OFDM numerologies supported by the NR system can be defined as shown in Table 1.

の時間単位の倍数として表現される。ここで、

であり、

である。ダウンリンク（downlink）及びアップリンク（uplink）送信は

の区間を有する無線フレーム（radio frame）で構成される。ここで、無線フレームは各々

の区間を有する１０個のサブフレーム（subframe）で構成される。この場合、アップリンクに対する１セットのフレーム及びダウンリンクに対する１セットのフレームが存在することができる。 The various field sizes in the time domain are related to the frame structure in the NR system.

Expressed as a multiple of the time unit of. here,

And

Is. Downlink and uplink transmission

It is composed of a radio frame having a section of. Here, each wireless frame

It is composed of 10 subframes having a section of. In this case, there can be one set of frames for the uplink and one set of frames for the downlink.

FIG. 2 shows the relationship between uplink frames and downlink frames in a wireless communication system to which the method proposed herein is applicable.

以前に始めなければならない。 As shown in FIG. 2, the transmission of the uplink frame number i from the terminal (User Equipment: UE) starts from the start of the corresponding downlink frame on the terminal.

Must start before.

の増加する順に番号が付けられて、無線フレーム内で

の増加する順に番号が付けられる。１つのスロットは

の連続するＯＦＤＭシンボルで構成され、

は用いられるヌメロロジー及びスロット設定（slot configuration）によって決定される。サブフレームでスロット

の開始は同一サブフレームでＯＦＤＭシンボル

の開始と時間的に整列される。 For numerology μ, the slot is in the subframe

Numbered in increasing order, within the wireless frame

Numbered in descending order of. One slot is

Consists of consecutive OFDM symbols of

Is determined by the numerology used and the slot configuration. Slot in subframe

Starts with an OFDM symbol in the same subframe

Is aligned in time with the start of.

Not all terminals can transmit and receive at the same time, which means that not all OFDM symbols in the downlink slot or uplink slot are available.

Table 2 shows the number of OFDM symbols per slot for a normal CP in numerology μ, and Table 3 shows the number of OFDM symbols per slot for an extended CP in numerology μ.

NR Physical Resource

In relation to the physical resources in the NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. Can be considered.

Hereinafter, the physical resources that can be considered in the NR system will be specifically described.

Earlier, in connection with the antenna port, the antenna port is defined so that the channel on which the symbol on the antenna port is carried can be inferred from the channel on which other symbols are carried on the same antenna port. If the large-scale property of the channel carrying the symbol on one antenna port can be inferred from the channel carrying the symbol on the other antenna port, then the two antenna ports are QC / QCL (quasi co). -located or quasi co-location) can be said to be in a relationship. Here, the wide range characteristic is one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing. include.

FIG. 3 shows an example of a resource grid supported in a wireless communication system to which the method proposed herein can be applied.

サブキャリアで構成され、１つのサブフレームが１４・２μＯＦＤＭシンボルで構成されることを例示的に技術するが、これに限定されるものではない。 As shown in FIG. 3, the resource grid is on the frequency domain.

It is exemplary, but not limited to, the technique of being composed of subcarriers and one subframe being composed of 14.2 μOFDM symbols.

サブキャリアで構成される１つまたはそれ以上のリソースグリッド及び

のＯＦＤＭシンボルにより説明される。ここで、

である。前記

は、最大送信帯域幅を表し、これは、ヌメロロジーだけでなく、アップリンクとダウンリンクとの間にも変わることができる。 In an NR system, the transmitted signal is

One or more resource grids consisting of subcarriers and

Explained by the OFDM symbol of. here,

Is. Said

Represents the maximum transmit bandwidth, which can vary between uplinks and downlinks as well as numerology.

In this case, as shown in FIG. 3, one resource grid can be set for each of the numerology μ and the antenna port p.

により固有的に識別される。ここで、

は、周波数領域上のインデックスであり、

は、サブフレーム内でシンボルの位置を称する。スロットでリソース要素を称するときには、インデックス対

が用いられる。ここで、

である。 Each element of the resource grid for numerology μ and antenna port p is called a resource element and is an index pair.

Is uniquely identified by. here,

Is an index on the frequency domain

Refers to the position of the symbol in the subframe. When referring to a resource element in a slot, index pair

Is used. here,

Is.

は、複素値（complex value）

に該当する。混同（confusion）される危険がない場合、あるいは特定アンテナポートまたはヌメロロジーが特定されなかった場合には、インデックスｐ及びμは、ドロップ（drop）されることができ、その結果、複素値は、

または

になることができる。 Resource elements for numerology μ and antenna port p

Is a complex value

Corresponds to. Indexes p and μ can be dropped if there is no risk of confusion, or if a particular antenna port or numerology is not identified, so that the complex value will be

or

Can be

連続的なサブキャリアで定義される。周波数領域上で、物理リソースブロックは、０から

まで番号が付けられる。このとき、周波数領域上の物理リソースブロック番号（physical resource block number）

とリソース要素

との間の関係は、数式１のように与えられる。 Also, the physical resource block is on the frequency domain.

Defined by continuous subcarriers. Physical resource blocks from 0 on the frequency domain

Is numbered up to. At this time, the physical resource block number on the frequency domain.

And resource elements

The relationship between and is given as in Equation 1.

まで番号が付けられる。 Also, in connection with the carrier part, the terminal can be configured to receive or transmit using only a subset of the resource grid. At this time, the set of resource blocks set to be received or transmitted by the terminal starts from 0 on the frequency domain.

Is numbered up to.

Self-contained slot structure

The TDD (Time Division Duplexing) structure considered in NR systems is a structure that processes both uplinks (Uplink, UL) and downlinks (Downlink, DL) into one subframe. This is to minimize the latency of data transfer in the TDD system, and the above structure is called a self-contained subframe structure.

FIG. 4 shows an example of a self-contained subframe structure to which the method proposed herein can be applied. FIG. 4 is for convenience of explanation and does not limit the scope of the present invention.

With reference to FIG. 4, it is assumed that one subframe is composed of 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols, as in the case of legacy LTE.

In FIG. 4, the shaded area 402 indicates a downlink control area, and the black portion 404 indicates an uplink control area. Further, the area other than the area 402 and the area 404 (that is, the area without another display) can be used for the transmission of the downlink data (downlink data) or the uplink data (uplink data).

That is, uplink control information and downlink control information are sent in one "self-contained subframe". In contrast, for data, uplink or downlink data is sent in one "self-contained subframe".

When using the structure shown in FIG. 4, downlink transmission and uplink transmission are sequentially performed in one self-contained subframe, downlink data is transmitted in one slot, and uplink Ack / Nack is used. Can also be sent and received.

As a result, you can reduce the time it takes to retransmit data in the event of a data transmission error. Therefore, you can minimize the delay associated with data delivery.

In the self-contained subframe structure as shown in FIG. 4, the base station (eNodeB, eNB, gNB) and / or the terminal (terminal, UE (User Equipment)) is set to the reception mode in the transmission mode. A time gap is required for the process of conversion or the process of switching from receive mode to transmit mode. When performing uplink transmission after downlink transmission in the above self-contained subframe in relation to the above time interval, some OFDM symbols shall be set in the protection period (Guard Period, GP). Can be done.

Carrier merger in general

The communication environment considered in the embodiment of the present invention includes all multi-carrier support environments. That is, the multi-carrier system or carrier aggregation (CA) system used in the present invention has a bandwidth smaller than the target bandwidth when configuring the target wide band in order to support the wide band. A system that uses one or more component carriers (CC: Component Carrier) that have been merged (aggregation).

In the present invention, multicarrier means merging of carriers (or carrier aggregation), where carrier merging is not only merging between adjacent carriers, but also non-contiguous carriers. Means both of the mergers between. Also, the number of component carriers aggregated between the downlink and the uplink can be set differently. The case where the number of downlink component carriers (hereinafter referred to as "DL CC") and the number of uplink component carriers (hereinafter referred to as "UL CC") are the same is referred to as asymmetric assembly, and the number thereof. The case where is different is called an asymmetric assembly. Such carrier merging can be used in combination with terms such as carrier aggregation, bandwidth aggregation, and spectrum aggregation.

Carrier merging, which consists of combining two or more component carriers, aims to support up to 100 MHz bandwidth in LTE-A systems. When combining one or more carriers with a bandwidth smaller than the target bandwidth, the bandwidth of the combined carriers is the bandwidth used by the existing system to maintain compatibility with the existing IMT system. It can be limited to width. For example, in an existing 3GPP LTE system, it supports {1.4,3,5,10,15,20} MHz bandwidth, and in a 3GPP LTE-advanced system (ie, LTE-A), an existing system. For compatibility with, it is possible to utilize only the bandwidth to support bandwidths larger than 20 MHz. The carrier merging system used in the present invention can also define a new bandwidth to support carrier merging regardless of the bandwidth used in the existing system.

The LTE-A system uses the concept of cells to manage radio resources.

The carrier merged environment described above can be referred to as a multiple cells environment. A cell is defined as a pair of downlink resource (DL CC) and uplink resource (UL CC), but the uplink resource is not a required element. Therefore, the cell can be composed of the downlink resource alone or the downlink resource and the uplink resource. If a particular terminal has only one configured serving cell, it can have one DL CC and one UL CC, but if the particular terminal has more than one configured serving cell. , Has as many DL CCs as there are cells, and the number of UL CCs is equal to or less than that.

On the contrary, DL CC and UL CC can be configured. That is, when a specific terminal has a plurality of set serving cells, a carrier merge environment in which UL CC is larger than the number of DL CC can also be supported. That is, carrier aggregation can be understood as merging two or more cells having different carrier frequencies (center frequencies of cells). The "Cell" referred to here should be separated from the "Cell" as an area covered by a commonly used base station.

The cells used in the LTE-A system include a primary cell (PCell: Primary Cell) and a secondary cell (SCell: Secondary Cell). The P cell and the S cell can be used as a serving cell. In the case of a terminal that is in the RRC_CONNECTED state but has no carrier merge set or does not support carrier merge, there is only one serving cell composed of only P cells. On the other hand, in the case of a terminal in the RRC_CONNECTED state and set to carrier merge, one or more serving cells can exist, and the whole cell includes a P cell and one or more S cells.

Serving cells (P cell and S cell) can be set by RRC parameters. PhysCellId has an integer value from 0 to 503 as the physical layer identifier of the cell. SCellIndex has an integer value from 1 to 7 as a short identifier used to identify the S cell. ServCellIndex has an integer value from 0 to 7 as a short identifier used to identify a serving cell (P cell or S cell). The 0 value is applied to the P cell, and the SCellIndex is given in advance for application to the S cell. That is, the cell having the smallest cell ID (or cell index) in ServCellIndex is the P cell.

The P cell means a cell operating on the primary frequency (or primary CC). The terminal can be used to perform an initial connection setting process or a connection resetting process, and can also refer to a cell designated in the handover process. Further, the P cell means a cell that is the center of control-related communication among the serving cells set in the carrier merge environment. That is, the terminal can receive and transmit the PUCCH allocation only in its own P cell, and can use only the P cell to acquire the system information or change the monitoring procedure. E-UTRAN (Evolved Universal Radio Access) uses a higher-layer RRC connection reconfiguration (RRCCconnectionReconnection) message that includes mobility control information (mobilityControlInfo) in a terminal that supports a carrier merged environment. It is also possible to change only the P cell to.

The S cell means a cell operating on a secondary frequency (or Secondary CC). Only one P cell can be assigned to a specific terminal, and one or more S cells can be assigned. The S-cell is configurable after the RRC connection has been set up and can be used to provide additional radio resources. PUCCH does not exist in the remaining cells other than the P cell among the serving cells set in the carrier merging environment, that is, the S cell. When adding an S cell to a terminal that supports a carrier merge environment, the E-UTRAN can provide all system information regarding the operation of related cells in the RRC_CONNECTED state by a specific signal. Changes in system information can be controlled by releasing and adding related S-cells, where the RRCConnectionReconnection message of the upper layer can be utilized. The E-UTRAN can perform specific signaling having different parameters for each terminal rather than broadcasting in the related S cell.

After the initial security activation process is initiated, the E-UTRAN can configure a network containing one or more S cells in addition to the initially configured P cells in the connection setup process. In the carrier merge environment, the P cell and the S cell can operate as their respective component carriers. In the following embodiments, the primary component carrier (PCC) can be used with the same meaning as the P cell, and the secondary component carrier (SCC) can be used with the same meaning as the S cell.

The NR system is a physical channel (Physical channel) for transmitting UCI (uplink control information) including information such as HARQ-ACK, SR (scheduling request), and CSI (channel state information). ) Can be supported.

The PUCCH is then a small PUCCH that supports a small UCI payload (eg, 1-2-bit UCI) with a UCI payload and a large UCI payload (eg, 1-2-bit UCI). Is classified into a large (big) PUCCH that supports two or more bits and a maximum of several hundred bits (more than 2 bits and up to payloads of bits).

In addition, the small PUCCH and the large PUCCH also have a short PUCCH with a short duration (eg, 1-2 symbol sections) and a long duration (eg, 4-14 symbol sections), respectively. It is classified into a long PUCCH having.

Table 4 below shows an example of the PUCCH format.

は、ＯＦＤＭシンボルにおいてＰＵＣＣＨ送信の長さを示し、ＰＵＣＣＨフォーマット１、３及び４はロングＰＵＣＣＨと、ＰＵＣＣＨフォーマット０及び２は短いＰＵＣＣＨと呼ばれることができる。 In Table 4,

Indicates the length of PUCCH transmission in an OFDM symbol, PUCCH formats 1, 3 and 4 can be referred to as long PUCCH, and PUCCH formats 0 and 2 can be referred to as short PUCCH.

The symbol "/" as used herein can be construed as having the same meaning as "and / or", where "A and / or B" comprises at least one of "A or B". Can be interpreted in the same way.

The long PUCCH can then be used primarily when a medium / large UCI payload must be transmitted, or to improve coverage of a small UCI payload. ..

Then, when it is necessary to further extend the coverage as compared with the long PUCCH, the long PUCCH of a plurality of slots (multi-slot) in which the same UCI information is transmitted over the plurality of slots is supported. Can be done.

Here, the operation of transmitting the long PUCCH using the plurality of slots can include the operation of repeatedly transmitting the long PUCCH in the plurality of slots.

For example, if coverage cannot be ensured under a given UCI payload and code rate, it will be repeatedly transmitted using long PUCCH in multiple slots. It may be attempted to ensure coverage via gain.

LTE systems support only 15 kHz subcarrier spacing, except in special cases such as MBMS and NB-IoT, whereas NR systems use various use cases as described above. It supports various numerologies such as 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz in consideration of case) and deployment scenario.

Here, numerology refers to subcarrier spacing and cyclic prefix (CP).

When using large subcarriers in NR (eg, subcarrier spacing above 30 kHz), use a long PUCCH that uses all 14 symbols in the slot due to the reduced slot duration. However, it is inevitable that the coverage will be reduced as compared with LTE PUCCH due to physical factors.

Therefore, in such a case, it is necessary to improve the coverage by using the long PUCCH of a plurality of slots (multi-slot).

In addition, even when the same 15 kHz subcarrier interval as LTE is used, the coverage of the HARQ-ACK repetition level is ensured in LTE to support the same deployment scenario (deployment scenario) as LTE. Therefore, it is necessary to use a multi-slot long PUCCH.

Hereinafter, the present specification proposes a method of setting and operating the number of slots of a multi-slot long PUCCH in consideration of various numerologies in NR and the influence of coverage thereof.

How to set the number of slots in a multi-slot long PUCCH

In the NR system, when the multi-slot long PUCCH is used for the above reason, the multi-slot long PUCCH is spanned for each UE in consideration of the difference in path loss depending on the position of the UE. ) It is possible to set and select a plurality of slot lengths.

For example, when the number of slots of the long PUCCH of the multi-slot is set to four and selected, the number of slots of the long PUCCH of the multi-slot X = {x0, x1, x2, x3}. ..

Here, the relationship of x0 <= x1 <= x2 <= x3 can be set, and x0 = 1 is set to non-multi-slot (non-multi-slot) or long PUCCH (single slot) of a single slot. You can choose long PUCCH.

At this time, the maximum value (for example, x3) of the number X of slots of the multi-slot long PUCCH (multi-slot long PUCCH) is the maximum coverage / link budget / MCL (coverage / link) required at least in the cell. It is set to satisfy budget / MCL).

Further, the intermediate value (for example, x1 and x2) can be set to a value smaller than the maximum value (for example, x3) to allocate the minimum number of slots required in a given situation.

Further, the number of slots of the long PUCCH of the multi-slot can be set (configure) via a UE specific RRC setting (UE-specific RRC configuration) or a dynamic instruction (dynamic indication) via DCI.

Further, after setting the slot length of a large number (for example, four) multi-slot long PUCCH (Multi-slot long PUCCH) to UE-specifically (UE-specifically) RRC setting (configure), it is dynamically instructed via DCI. The method of indication can be considered.

At this time, the PUCCH coverage correlates not only with the number of slots but also with the long PUCCH interval, the subcarrier interval, and the like in the multi-slot long PUCCH.

Therefore, in order to determine the value of the number of slots in a multi-slot long PUCCH that supports various coverages as described above, a specific long PUCCH interval and subcarrier spacing must be assumed.

Hereinafter, in the present specification, the long PUCCH section and the subcarrier interval assumed at this time are determined as the reference long PUCCH section (reference long PUCCH ration) Lref, the reference subcarrier interval (reference subcarrier spacing) Sref, and thus. The number of multi-slot long PUCCH slots that have been created is called Xref.

Further, the long PUCCH interval and the subcarrier interval actually used for the long PUCCH transmission in NR are the same as or different from the reference value.

At this time, the values used for the actual transmission are referred to as an actual long PUCCH interval L and an actual subcarrier spacing S, respectively.

The reference or the actual long PUCCH section means 1) the total number of symbols including the UCI symbol and the DMRS symbol constituting the PUCCH, or 2) among the symbols constituting the PUCCH. It can mean the number of UCI symbols used for UCI transmission.

At this time, in the NR, various long PUCCH sections and subcarrier intervals can be supported in addition to the Lref and Sref values as described above. However, in consideration of such a situation, the multi-slot long PUCCH slot in the NR. The following method is proposed as a method for setting the number (configure).

A method of setting the number of slots in a multi-slot long PUCCH with a long PUCCH section at the same subcarrier interval.

In the same subcarrier interval (eg, reference subcarrier spacing), the long PUCCH interval L may differ from the reference long PUCCH interval Lref.

At this time, assuming that the value of the number of slots of the long PUCCH of the separate multi-slot for each long PUCCH section, for example, four values can be set for each long PUCCH section, Y = {y0, y1, y2, y3}, Z. = {Z0, z1, z2, z3} and the like can be configured.

At this time, the UE is one of the number of long PUCCH slots (for example, Y, Z, ...) Of a large number of multi-slots configured by the long PUCCH section configured by another method. You can choose one.

Then, one of the values of the number of slots of the long PUCCH of the selected multi-slot is set by the indication method of the number of long PUCCH of the multi-slot to form the long PUCCH of the multi-slot. be able to.

For example, when the number of slots Y of the long PUCCH of the multi-slot is selected by the long PUCCH section L, one of the Y values, for example, {y0, y1, y2, y3}, is set via the UE specific RRC setting or DCI. It can be set by a specific instruction.

Alternatively, the slot lengths of a large number (eg, 4) multi-slot long PUCCHs can be dynamically set via DCI after the RRC is set specifically for the UE.

However, the above method has a disadvantage that the signaling overhead is large because the number of long PUCCH slots of the multi-slot is set separately for each long PUCCH section.

Therefore, in order to improve such a disadvantage, after setting only the number of slots Xref of the long PUCCH of the reference multi-slot assuming Lref and Sref, the long multi-slot by the long PUCCH section set in the UE (configure) is long. The slot value of PUCCH can be indicated by implicit indication via Xref and Lref.

At this time, the long PUCCH section is referred to as L, and the number of multi-slot long PUCCH slots resulting from the long PUCCH section is referred to as Y.

After that, the UE can obtain Y for the long PUCCH section set to itself by using L, Lref, and Xref as shown in Equation 2 as follows.

At this time, the Lref can be the longest long PUCCH interval (ie, Lref = 14) in view of the fact that the main purpose (motivation) of the multi-slot long PUCCH is coverage extension.

When Lref / L is not an integer (for example, when Lref = 14 and L = 10), it can be converted into an integer by ceiling, floor, truncation, or the like.

Integerization can be a sealing operation as in Equations 3 and 4 in order to find the smallest value among the integers that satisfy the coverage / link budget / MCL (coverage / link budget / MCL).

はｃｅｉｌｉｎｇ動作を意味する。 here,

Means a ceiling operation.

であり、ｃｅｉｌｉｎｇを適用した最終Ｙ値はＹ＝｛１、３、１２、６４｝となる。 For example, if Lref = 14, Xref = {1, 4, 16, 64}, and L = 10.

The final Y value to which sealing is applied is Y = {1, 3, 12, 64}.

At this time, the UE can configure a multi-slot long PUCCH by using the Y obtained by the above method.

Further, the ceiling operation can be replaced with other integer conversion methods such as floor and truncation.

Further, the UE defines a set Xref = {1, x1, x2, x3} for the number of slots (configurable number of slots) that can be set for the reference PUCCH symbol interval Lref (for example, Lref = 14 symbols). , One value in the Xref (eg x1 = 2, x2 = 4, x3 = 6 or 8) can be set from gNB.

At this time, assuming that one of the values of Xref assigned from gNB is xref, the number of slots y of the multi-slot long PUCCH applied to the actual transmission can be set by the following method.

(Method 1)

When xref> 1 and the actual PUCCH symbol interval is given as the L symbol, the actual number of slots y can be set as in Equation 5.

Here, f {・} can be a function such as ceiling, flooring, or truncation.

(Method 2)

When xref = 1, the actual number of slots y is set to y = 1 for any actual PUCCH symbol duration L.

How to set the number of slots in a multi-slot long PUCCH when the subcarrier interval changes

As described above, the PUCCH coverage correlates not only with the number of slots and the long PUCCH section but also with the subcarrier interval in the multi-slot long PUCCH.

Therefore, when the long PUCCH section is given as the number of symbols, even in the same long PUCCH section, if the subcarrier interval is N times, the absolute time of the long PUCCH length becomes 1 / N times, so that the transmission power ( When the interval power) is constant, the PUCCH coverage is proportionally reduced.

In addition, since the received power is generally inversely proportional to the square of the distance between the transmitting end (transmitter) and the receiving end (receiver), the coverage converted into the distance is the transmission energy, that is, the proportional relationship. , Transmission power (transmission power) × transmission interval (transmission duration) is inversely proportional to the square.

Therefore, in the above embodiment, when the subcarrier interval is N times, the long PUCCH transmission energy is 1 / N times, so that the PUCCH coverage converted into a distance is 1 / √N times.

Further, the requirement of PUCCH coverage may change depending on the subcarrier interval, which can be expressed by the following maximum TA (maximum Timing Advance) setting method based on the subcarrier interval.

At this time, max TA can be set for each subcarrier interval, set to the same max TA value regardless of the subcarrier interval, or set to SIB (System Information Block) or the like. ..

When set for each subcarrier interval, max TA is set so as to have a relationship that is inversely proportional to the subcarrier interval or inversely proportional to the square root.

Therefore, for each case, the following method of setting the number of slots of the multi-slot long PUCCH can be considered.

When max TA is scaled according to the subcarrier interval

When Max TA is scaled in an inversely proportional relationship with the subcarrier interval (for example, when the subcarrier interval is N times larger than Sref, max TA is 1 / N times or 1 / √N. (When scaling to), PUCCH coverage due to subcarrier spacing can be expected to be reduced by the same rate.

Therefore, even if the subcarrier interval used for PUCCH transmission has a value different from that of Sref, the UE can configure a multi-slot long PUCCH by applying the same value set with reference to Sref. ..

That is, when the number of long PUCCH (reference multi-slot long PUCCH) slots of the reference multi-slot assuming Lref and Sref is Xref, the UE is related to the subcarrier interval for the same long PUCCH section L as Lref. It is possible to apply the Xref value as it is to the number Y of long PUCCH slots of the multi-slot for the long PUCCH section L set by oneself.

At this time, the UE can configure a multi-slot long PUCCH by using Y obtained by using the above-mentioned formula 6.

When max TA is fixed regardless of the subcarrier interval

The following relates to a method of setting the number of slots of a multi-slot long PUCCH when Max TA is a fixed value regardless of the subcarrier spacing.

In other words, if all UEs operating at different subcarrier intervals are configured to support the same PUCCH coverage, the multislot long PUCCH slots will be reduced in coverage according to the subcarrier intervals. It may be necessary to adjust the number.

As described above, when the subcarrier interval S becomes N times, that is, S = N * Sref and the PUCCH transmission section (transmission duration) becomes 1 / N times, the same PUCCH transmission power (transmission power) is assumed. Then, the temporal coverage is reduced in inverse proportion to the square root.

Therefore, in order to compensate for the coverage reduction in the above case, the PUCCH transmission power is increased N times, or the number of slots of the multi-slot long PUCCH is increased N times in the same PUCCH transmission power to increase the PUCCH transmission section. It can be set to be the same as in the case of Sref.

At this time, in an NR in which various subcarrier intervals coexist, there may be a case where the same coverage or max TA is supported regardless of the subcarrier intervals.

At this time, the UE has set the long PUCCH section L which is the same as the Lref by using the subcarrier intervals S, the Sref, and the Xref as shown in the following formula 7. Y can be obtained for.

At this time, the UE can configure a multi-slot long PUCCH by using Y obtained by the method of the above-mentioned formula 7.

When Max TA is SIB configurable (SIB composite)

When Max TA is configurable by SIB or the like, the max TA assumed at the time of determining the number of slots Xref of the long PUCCH (reference multi-slot long PUCCH) of the reference multi-slot is TAmaxref, and the max TA is set (configure). Assuming that TA is TAmax, the number of slots of the multi-slot long PUCCH can be determined by utilizing the relationship with TAmaxref.

As mentioned above, in general, the received power is inversely proportional to the square of the distance between the transmitting end (transmitter) and the receiving end (receiver). In other words, the coverage converted into the distance is used. In order to increase by N times, the transmission energy must be increased by N2 times.

In order to increase the transmission energy by N2 times, the transmission power must be increased by N2 times, or in the case of the same transmission power, the transmission section must be increased by N2 times.

However, it may not be possible to increase the transmit power, as in Coverage limited situations.

At this time, the UE assumes the same PUCCH transmission power as when the Xref is determined, and uses the relationship between TAmax and TAmaxref as shown in the following equation 8 to set the multi for the long PUCCH section L. The slot number Y of the long PUCCH of the slot can be obtained by a method as shown in the following formula 8.

More generally, using the relationship between TAmax and TAmaxref as follows, the UE sets the number Y of multi-slot long PUCCHs for the long PUCCH interval L set by itself as in Equation 9 as follows. It can be obtained in various ways.

In the above formula 9, M can typically have a value such as 1 or 2, and may be a value determined in consideration of the situation of path loss of the channel and the like.

Further, in consideration of the case where the subcarrier interval S is different from Sref, the UE obtains the number Y of slots of the multi-slot long PUCCH with respect to the long PUCCH section L set to itself by using the equation 10. be able to.

The UE can configure a multi-slot long PUCCH by using the Y obtained by the method as described in Equation 10.

If the above method is generalized, it can be expressed as Equation 11.

Using the above relational expression, a long PUCCH interval and / or a subcarrier interval and / or an RRC parameter (parameter) by max TA can be set.

At this time, the UE can calculate the number of slots of the multi-slot long PUCCH from Xref using the above equation 11 to configure the multi-slot long PUCCH.

When the UE configures a multi-slot long PUCCH by the above method, a single-slot long PUCCH (single-slot long PUCCH) (that is, the number of slots of the multi-slot long PUCCH = 1) can be selected. , One of the Y values of the number of slots (for example, {y0, y1, y2, y3}) of the long PUCCH of the multi-slot obtained by using the above relationship can be set to "1".

For example, the largest or smallest Y value can be replaced with "1" (for example, {1, y1, y2, y3}) to turn off the long PUCCH of the multi-slot. can.

Alternatively, "1" is basically supported for the above purpose, and the remaining values are set to be scaled with a relational expression with a long PUCCH interval, a subcarrier interval, and max TA as in the above method. can do.

Here, it is assumed that the power of the received signal is the center frequency, assuming that the power of the transmitted signal is constant and an antenna is used which is proportional to the magnitude of the wavelength (wavelength) of the carrier frequency of the transmitted signal. It is inversely proportional to the square.

In this case, since the UL transmission range reduction and the cell range reduction are reduced in the same relationship, the UE has a multi-slot long PUCCH slot number Y value determined at the UL reference carrier frequency (UL reference carrier frequency). Can be applied in the same way.

Further, the UE sets the slot number Y value of the multi-slot long PUCCH for each carrier frequency in consideration of the possibility that the received power in the eNB due to the change in the antenna size and the beamforming may be different. Can be done.

In addition, the UE scales with the path loss ratio measured for each beam, reflecting that the path loss may differ for each beam when applying beamforming. Can be applied.

For example, the path loss of beam1 and beam2 measured by using channel state information (CSI) or sounding reference signal (SRS) via DL or UL is PL1 respectively. , PL2, the UE can determine the number of slots Y2 of the long PUCCH of the multi-slot at the time of transmitting the beam2 by using the ratio of PL1 and PL2.

For example, when the UE is subject to transmission limitation (power limitation) and transmits with the same transmission power P, the eNB reception power for the signal transmitted to beam1 is P * PL1, and the reception power of beam2 is P * PL2. , The number of slots of the long PUCCH of the multi-slot can be scaled and applied at the ratio of PL1 / PL2.

In other words, when a UE that has transmitted a multi-slot long PUCCH using beam1 makes a beam change to beam2 with the same transmission power and transmits it, the multi-slot long PUCCH is transmitted to beam1. Speaking of the number of slots of Y1, the number of slots of the multi-slot long PUCCH when transmitting to beam2 can be determined so that the Y2 value has a relationship as shown in the following equation 12.

Skipping or rate matching operation in multi-slot long PUCCH

Whether the PUCCH symbol interval L and the PUCCH transmission cycle (period) or the corresponding number of multi-slot long PUCCH slots is an RRC-configured value (RRC configuration) or a large number of RRC-configured candidate values (RRC configuration). Candate values), which can be a value indicated or determined via DCI. (RRC setting + DCI instruction)

In contrast, due to DL symbols or gap period or other uplink resources (eg, short PUCCH, SRS), the practically possible PUCCH symbol value La in a particular PUCCH slot is less than L. Can be a value.

In such a case, the La value is a value dynamically instructed via DCI or the like, or by another dynamic parameter (or others) (dynamic parameter (s)) transmitted via DCI or the like. It can be a determined value.

For example, the La value may be a value indicated or determined by a slot format indicator (SFI) or the like that informs the UE of the slot type via DCI.

In addition, in the present specification, the PUCCH symbol section L and the PUCCH transmission cycle (period) or the number of slots of the corresponding multi-slot long PUCCH are instructed / set by the RRC setting or the RRC setting + DCI instruction method as described above. In the state, the PUCCH symbol interval La capable of PUCCH transmission in a slot of a specific PUCCH dynamically determined by a DL symbol or a gap period or another UL resource (eg, short PUCCH, SRS) is L. If it becomes smaller, we suggest that it works in the following way.

(Method 1)

Method 1 is to skip the PUCCH transmission in the slot.

In this method, the number of long PUCCH slots actually transmitted is reduced by the amount of skipping PUCCH transmission, as compared with the number of long PUCCH slots of multi-slots set by the RRC setting or the RRC setting + DCI instruction method. do.

(Method 2)

Method 2 is a method in which PUCCH transmission in the slot is omitted (skip), and the number of slots corresponding to the omitted is reflected in the set period (period) or the number of slots of the long PUCCH of the multi-slot to be expanded. ..

In this method, the number of slots of the long PUCCH of the multi-slot set by the RRC setting or the RRC setting + DCI instruction method is the same as the number of the slots of the long PUCCH actually transmitted.

(Method 3)

Method 3 transmits PUCCH in the La symbol section when the PUCCH symbol section (symbol ration) La is P% or more of L, or (L-La) is Q symbol or less, and La is L. If it is less than P%, or if (L-La) exceeds the Q symbol, then Method 1 or Method 2 is applied.

In other words, compared to the long PUCCH section L set by the RRC setting or the RRC setting + DCI instruction method, the long PUCCH section that can actually be used is reduced by the amount equal to or less than the Q symbol due to the dynamic setting. , Rate-matching based on the La symbol, and if not (that is, the difference between L and La is larger than the Q symbol), the above method 1 or method 2 is applied.

In addition, at the L symbol positions originally set / instructed via RRC / DCI, etc., the Q symbol is a combination of the first Q symbol or less, the last Q symbol or less, the first part of the symbol, and the last part of the symbol. A method is also possible in which the PUCCH is rate-matched to the La symbol section only when the following is not applicable, and the method 1 or the method 2 is applied when the following is not possible.

In the case of the above method 3, the UCI coded bit is generated based on the L symbol, and only the (L-La) symbol is punctured and mapped / transmitted, or the La symbol is used. It is possible to generate and map / transmit a UCI coded bit based on the La symbol by rate matching according to the above.

In the above, in the case of a time domain OCC-based long PUCCH (for example, up to 2 bits), methods 1 and 2 are applied, and a long PUCCH not based on the time domain OCC (for example). For example, in the case of 2 bits or more (for more than 2 bits), a method of applying methods 1, 2 and 3 is also possible.

In the above, the number of symbols L or La corresponding to the PUCCH symbol section means the total number of symbols including the UCI symbols and DMRS symbols constituting the PUCCH, or the symbols constituting the PUCCH that transmit the UCI. Can mean a number.

At this time, the UE either operates by setting one of the above methods from the upper layer (confiture), or explicitly indicates in the spec (spec) that the UE operates by only one of the above methods. can do.

PUCCH resource setting method in pre-DFT OCC-based long PUCCH

In the NR, a method of transmitting a long PUCCH to a pre-DFT (discrete Fourier transform) OCC base can be considered to simultaneously support a large UCI payload and user multiplexing.

Here, OCC means an orthogonal cover code used for user classification, and may be a Walsh code or a DFT sequence.

At this time, in the Pre-DFT-based long PUCCH, the OCC length (length) may be set in consideration of the user multiplexing capacity to be supported and the UCI payload (payload) to be transmitted. can.

On the other hand, the UCI payload that can be transmitted by the Pre-DFT-based long PUCCH is inversely proportional to the OCC length.

Therefore, the OCC length should be flexibly set by higher layer signaling or dynamic indication via DCI in consideration of the UCI payload and user multiplexing capacity. be able to.

Further, for coherent demodulation of PUCCH, RS (reference signal) transmission for channel estimation is required for each UE.

At this time, the following method can be considered as an orthogonal RS (orthogonal RS) transmission method for channel separation between users.

(Method 1)

This is a CDM (code division multiplexing) transmission method.

The CDM transmission method is a method of superimposing and transmitting (pseudo) orthogonal ((quasi-) orthogonal) codes.

For example, when the PUCCH is transmitted to 1RB, the RS for each UE can be transmitted over the entire 1RB (sequence length = 12).

At this time, the orthogonal sequence can be a different time domain cyclic shift (CS) to the same sequence.

(Method 2)

It is an FDM (frequency division multiplexing) transmission method.

The FDM transmission method is a method of transmitting using different frequency resources, and frequency resources are continuously allocated to each UE (contigous FDM) and transmitted, or are transmitted in a comb form (comb type FDM). be able to.

Hereinafter, in consideration of the UCI and RS transmission methods, some methods for defining the PUCCH resource of the pre-DFT OCC-based long PUCCH as follows are proposed.

(Method 1)

How to define PUCCH resources by pairing UCI part (OCC) and RS

Method 1-A : A method of pairing OCC (UCI) and comb index (RS) to define a PUCCH resource.

For example, when comb (comb) type cross transmission is used among the FDM RS transmission methods, when integer-N OCC is set in the UCI part, each code index of N OCCs ( When the code index) is n (0 <= n <N, n: integer), n and N RS combs (comb) {(0, N, 2N, ...), (1, N + 1, 2N + 1, ...) ...), ... (N-1, 2N-1, 3N-1, ...)} Can be paired to set N PUCCH resources.

Method 1-B : A method of pairing OCC (UCI) and contigous FDM index (RS) to define a PUCCH resource.

For example, when the length-N OCC is set in the UCI part and the number of subcarriers used for transmitting the PUCCH is NPUCCHSC, the code index of each of the N OCCs is set to n (0 <= n). <N, n: integer) means n and N RS FDMs {(0, 1, 2, ...), (NPUCCHSC / N, NPUCCHSC / N + 1, NPUCCHSC / N + 2, ...), ... (NPUCCHSC) -NPUCCHSC / N, NPUCCHSC-NPUCCHSC / N + 1, NPUCCHSC-NPUCCHSC / N + 2, ...)} Can be paired to set N PUCCH resources.

Method 1-C : A method of pairing OCC (UCI) and CS (RS) to define a PUCCH resource.

Among the above-mentioned CDM RS transmission methods, when RS is divided by different CSs, when long-N OCC is set in the UCI part, each code index of N OCCs is set to n (0 <= n <N). , N: integer) means that n and N CS indexes m (0 <= m <N, m: integer) can be paired to set N PUCCH resources.

In the case of multiplexing between users, a larger DMRS CS distance between users may be advantageous in terms of channel estimation, but when pairing as described above in consideration of this, OCC For the case of length 4, the OCC code index n = 0, 1, 2, 3 is defined so that CS = 0, 3, 6, 9 are paired, respectively, and the OCC length 2 is set. If (n = 0, 1), CS = 0, 6 can be paired.

Method 1-D: A method of pairing a combination of OCC (for UCI) and (comb type FDM, CS) (for RS) to define a PUCCH resource.

For example, when the length-N OCC is set in the UCI part, if the code index of each of the N OCCs is n (0 <= n <N, n: integer), the code index n applied to the UCI is used. N PUCCH resources can be set by pairing N (comb, CS) combinations for RS configuration.

At this time, assuming that the number of combs constituting the N RS index combination is Ncomb and the number of CS is Ncs, N = Ncomb × Ncs is satisfied.

For example, in the case of N = 4, the combinations of (comb, CS) corresponding to the four RS indexes are (even subcarrier index, CS = 0), (even subcarrier index, CS = X), (odd subcarrier index, CS). = 0), can be set to (odd subcarrier index, CS = X) (where X> 0).

Method 1-E : A method of pairing a combination of OCC (for UCI) and (contigous FDM, CS) (for RS) to define a PUCCH resource.

For example, when the length-N OCC is set in the UCI part, and the code index of each of the N OCCs is n (0 <= n <N, n: integer), the code index n applied to the UCI is used. N PUCCH resources can be set by pairing N combinations of (integuous FDM, CS) for RS configuration.

At this time, assuming that the number of contigous FDMs constituting the N RS index combinations is Nfdm and the number of CSs is Ncs, N = Nfdm × Ncs is satisfied.

For example, when N = 4, the combinations corresponding to the four RS indexes (contigous FDM, CS) are (subcarrier index0 to NPUCCHSC / 2-1 and CS = 0), (subcarrier index0 to NPUCCHSC / 2-1 and CS). = X), (subcarrier index NPUCCHSC / 2 to NPUCCHSC-1, CS = 0), (subcarrier index NPUCCHSC / 2 to NPUCCHSC-1, CS = X) can be set (here, X> 0). ..

Methods 1-A to 1-E have a prior one-to-one relationship with N UCI OCC indexes and N RS indexes (eg, CS index, comb index, contigous FDM index) or combinations thereof. It is a method to make N combinations by specifying.

At this time, the one-to-one correspondence between OCC (UCI) and RS was fixed to the spec (spec) in one of the above methods 1-A to E, or among the above-mentioned methods by RRC signaling. It can be configured by one.

For example, did you define the PUCCH resource by pairing the RS comb index (method 1-A) with the OCC (UCI) using RRC signaling 1 bit, or pair the RS CS index (method 1-C)? It may be in the form of indicating whether the PUCCH resource has been defined.

(Method 2)

Method 2 is a method of defining all combinations of UCI part and RS with PUCCH resources.

In other words, if Method 1 has one RS index associated with one OCC, Method 2 has a PUCCH resource so that all or many RSs can be associated with one OCC and selected. Is a way to define.

For example, it is a method of defining and selecting a PUCCH resource so that two RS indexes correspond to one OCC.

At this time, the two indexes can be different comb indexes, different equality FDM indexes, or different CS indexes.

Interference randomization method in pre-DFT OCC-based long PUCCH

In the method of transmitting the pre-DFT OCC-based long PUCCH, an OCC is used for each symbol to support multiplexing between users.

Using the OCC guarantees orthogonality between users using different OCC codes within the same cell, but inter-cell interference can still occur.

For example, the inter-cell interference can be interference between UEs using the same OCC code in different cells.

Therefore, the present specification is based on cell-specific symbol- / hop- / slot-level OCC hopping in a pre-DFT OCC-based long PUCCH for inter-cell interference randomization in such a situation. Suggest to apply.

At this time, the cycle of cell-specific OCC hopping is in symbol units, frequency hop (frequency hop) units when frequency hopping is set, or slot unit hopping (inter-). It can be slot OCC hopping).

Further, in the Cell-specific symbol- / hop- / slot-level OCC hopping, OCC hopping can be performed according to a random hopping pattern (random hopping pattern) classified by cell.

At this time, in order to generate a special symbol- / hop- / slot-level OCC hopping pattern for each cell, a random hopping pattern derived from a physical cell ID (physical cell ID) or a virtual cell ID (virtual cell ID) ( A random hopping pattern) generation method can be used.

Further, as a parameter used in the random hopping pattern generation method, it can be configured by higher layer signaling so as to be selected from a physical cell ID and a virtual cell ID.

In addition, the UE generates a cell-specific symbol- / hop- / slot-level OCC hopping pattern via the assigned OCC index, symbol / hop / slot index, cell ID, etc. without additional signaling and UCI information. Can be sent.

Then, when cell-specific symbol- / hop- / slot-level OCC hopping is applied to UCI in a Pre-DFT OCC-based long PUCCH, the UE pairs the UCI part (OCC) with RS and PUCCH. The PUCCH RS required for channel estimation of the UCI transmission channel by referring to the CS / comb index / comb index / contigous FDM index of the RS paired with the OCC (UCI part) assigned to it by "How to define resources". To generate.

Alternatively, the UE may use the CS / comb index / context FDM index of RS set for the OCC (UCI part) assigned to itself by the above-mentioned "method of defining all combinations of UCI part and RS with PUCCH resources". Can be referred to.

At this time, in the case of RS, 1) the same one RS is set in the slot, and the RS is a specific (for example, first) symbol or specific (for example, first) in the long PUCCH. ) It is determined that it is paired with the OCC used for the frequency hop, or 2) one RS is set for each frequency hop, and the RS is specified within the frequency hop or frequency hop (). For example, it can be determined to be paired with the OCC used for the first (first) symbol.

Or, conversely, when OCC (for UCI) and CS / comb index / contigous FDM index (for RS) are pre-paired and resources are allocated, inter-cell interference randomization is performed. To do this, CS / comb index / contigous FDM index (for RS) hopping is performed on the RS, and the UE acquires OCC information to be applied to the (paired) UCI from the corresponding RS hopping information and sends it to the UCI part. Can be applied.

Multi-slot long PUCCH transmission operation in dynamic TDD (Dynamic TDD) situations

Hereinafter, an operation of transmitting a long PUCCH using a plurality of slots (multi-slot) in a dynamic TDD (time division duplex) situation will be described.

Here, the operation of transmitting the long PUCCH using the plurality of slots can include the operation of repeatedly transmitting the long PUCCH in the plurality of slots.

As used herein, the TDD may be referred to as an unpaired spectrum or frame structure type 2, and the FDD (frequency division duplex) may be referred to as a paired spectrum or frame spectrum. It may be referred to as a structure type 1 (frame spectrum type 1).

Hereinafter, transmission of a long PUCCH using a plurality of slots is simply expressed as "multi-slot long PUCCH (multi-slot long PUCCH)".

The NR is dynamically adapted to changes in UL (uplink) traffic and / or DL (downlink) traffic volume, and is different services (eg, low latency service), high data rate service (high). Dynamic TDD (dynamic TDD) can be supported in order to efficiently support TDD between data (data rate service), etc.).

At this time, as a method of supporting dynamic TDD, DL slot, UL slot, unknown slot, and reserved slot can be set to semi-static or dynamic.

Here, a "reserved slot" is a slot that is TDD with another system or is configured for gNB to be used for other specific purposes other than NR DL and / or UL data transmission, NR UL and / Or may mean a slot where DL data transmission is not allowed.

Further, the "Unknown slot" is basically used for the same or similar purposes as the reserved slot.

However, the "Unknown slot" is a slot in which the gNB supports dynamic DL and / or UL transmission as needed, and may mean a slot that can override the slot format.

At this time, the slot format such as DL / UL / unknown slot can be set to semi-static or dynamic by gNB.

The slot format configured in this way can be a semi-static SFI (semi-static SFI (slot format indicator)) (in the case of a semi-static configuration) or a dynamic SFI (dynamic). It can be instructed to the UE by SFI) (in the case of dynamic configuration).

Further, the Reserved slot can be set to semi-static by gNB, and can be instructed to the UE by semi-static RRC signaling.

At this time, the DL / UL / unknown / reserved may be set semi-statically or dynamically in symbol units.

Here, when a multi-slot long PUCCH is transmitted over N slots, a multi-slot long PUCCH transmission section (transmission duration) is set by the starting slot and the number of slots. However, in the semi-static and / or dynamic TDD situation as described above, the multi-slot long PUCCH may operate in the following manner (option 1-1 to option 1-2). can.

(Option 1-1)

Option 1-1 transmits the first slot of the multi-slot long PUCCH in the slot designated as the starting slot (regardless of UL or unknown), and thereafter (N-1) slots (N-1). Et al.) Is a method of transmitting only in a slot set as UL by semi-static SFI (or dynamic SFI).

More specifically, the subsequent (N-1) slots (and others) are transmitted only in the slots set as UL by the semi-static SFI, or with the slots set as UL by the semi-static SFI. It may also be additionally transmitted to a slot set as UL by dynamic SFI.

Here, the subsequent (N-1) slots (and others) mean the slots to which the long PUCCH of the multi-slot is transmitted.

(Option 1-2)

Option 1-2 transmits the first slot of the multi-slot long PUCCH in the slot designated as the start slot (regardless of UL or unknown), and the subsequent (N-1) slots are semi-static SFIs. It is transmitted only in the slot set as UL or unknown by (or dynamic SFI).

More specifically, the subsequent (N-1) slots (and others) are transmitted only in the slots set as UL by the semi-static SFI, or with the slots set as UL by the semi-static SFI. It may also be additionally transmitted to a slot set as UL by dynamic SFI.

However, in the options 1-1 and 1-2, the transmission of the first slot may be valid only when the starting slot is set to unknown or UL by semi-static SFI (or dynamic SFI).

In the above, the meaning of "a specific slot is set to UL" may mean that all symbols or most of the symbols of the PUCCH transmission section in the slot are set to UL.

Alternatively, in the above, the meaning of "a specific slot is set to UL" means that the number of uplink symbols that can be used for in-slot PUCCH transmission is greater than or equal to the configured PUCCH interval (in symbols). It can be meant to be limited to cases.

In this case, if the number of uplink symbols that can be used for PUCCH transmission in the slot is smaller than the configured PUCCH interval (in symbols), it may be determined that the slot is not UL or unknown and the slot may operate. can.

At this time, when DL / UL / unknown / reserved is set in symbol units (configure), the number of uplink symbols is a count of only UL symbols, or UL symbols and unknown symbols. Can include.

Further, when a part of the PUCCH section (in-symbols) set for PUCCH transmission in the slot is not a UL symbol, the slot can be determined not to be UL or unknown and can be operated.

For example, if the difference between the PUCCH section (in symbols) set for PUCCH transmission in the slot and the UL symbol exceeds one symbol, it may be determined that the slot is not UL or unknown and the slot may operate. can.

Alternatively, it does not completely include the section by the PUCCH starting symbol index (PUCCH starting symbol index) and the section by the PUCCH section (in symbols) in which the section composed of continuous uplink symbols that can be used for PUCCH transmission is configured. And, it can be determined that the slot is not UL or unknown and can operate.

Alternatively, if the start slot to which the long PUCCH of the multi-slot is transmitted is not set to UL by semi-static SFI (or dynamic SFI), or UL or unknown, the following method (option 2-1 to option) is used. It can operate in 2-2).

(Option 2-1)

Option 2-1 transmits a multi-slot long PUCCH only in the N slots set as UL by semi-static SFI (or dynamic SFI) among the subsequent slots including the start slot and the designated slot. How to do it.

More specifically, the multi-slot long PUCCH is transmitted only in the subsequent slots containing the start slot and the designated slot, which are set to UL by the semi-static SFI, or by the semi-static SFI. It may also be transmitted to a slot set to UL and additionally to a slot set to UL by dynamic SFI.

(Option 2-2)

Option 2-2 is a multi-slot long PUCCH only in N slots set as UL or unknown by semi-static SFI (or dynamic SFI) among the subsequent slots including the start slot and the designated slot. Is a way to send.

More specifically, the multi-slot long PUCCH is transmitted only in the subsequent slots containing the start slot and the designated slot, which are set to UL by the semi-static SFI, or by the semi-static SFI. It may also be transmitted to a slot set to UL and additionally to a slot set to UL by dynamic SFI.

Here, in the above, the meaning that the specific slot is set to UL may mean that all the symbols or most of the symbols of the PUCCH transmission section in the slot are set to UL.

Alternatively, in the above, the meaning that a specific slot is set to UL means that the number of uplink symbols that can be used for PUCCH transmission in the slot is larger than or equal to the configured PUCCH interval (in symbols). It can mean limiting.

In this case, if the number of uplink symbols that can be used for PUCCH transmission in the slot is smaller than the configured PUCCH interval (in symbols), the slot is determined not to be UL or unknown and operates. be able to.

Further, when DL / UL / unknown / reserved is set in symbol units (configure), the number of the uplink symbols is one that counts only UL symbols or includes UL symbols and unknown symbols. Can be.

Further, when a part of the PUCCH section (in-symbols) set for PUCCH transmission in the slot is not a UL symbol, the slot can be determined not to be UL or unknown and can be operated.

For example, when the difference between the PUCCH interval (in symbols) set for PUCCH transmission in the slot and the UL symbol exceeds one symbol, it can be determined that the slot is not UL or unknown and the operation can be performed.

Alternatively, if the slot does not completely include the continuous uplink symbols that can be used for PUCCH transmission and the configured PUCCH start symbol index and the PUCCH interval (in symbols) interval. , UL or unknown, and can operate.

The specific method can be set semi-statically or dynamically to work with any one of the four options described above.

As an example, which of the four options is applied via the DCI instructing PUCCH transmission, which of the options 1-1 and 1-2 is applied, or the option 2-1. It is possible to dynamically instruct the terminal which method of 2-2 and 2-2 is applied.

The multi-slot long PUCCH can omit PUCCH transmission for a slot set as DL and / or reserved by semi-static SFI (or dynamic SFI).

At this time, the omitted slot may or may not be counted as one of the N slots assigned to the PUCCH transmission.

As described above, in FDD / TDD (or paired / unpaired spectrum), the slot actually transmitted in the multi-slot long PUCCH transmission is determined by the following step.

At this time, the number of transmission slots set in the long PUCCH of the multi-slot can be set to N, and the transmission symbol area can be set (or instructed) from the symbol # K1 to the K symbol in the transmission slot.

(Step 1)

The first step (step 1) to determine the slot for multi-slot long PUCCH transmission is from symbol # K1 to K when set by the semi-static DL / UL configuration. N slots composed of slots in which the UL symbols are set to unknown or UL are determined to be multi-slot long PUCCH transmission slots.

As an example, when a multi-slot long PUCCH is instructed (or set) between slots # 0 and four slots, and K1 = 5 and K = 6 are instructed (or set), slot # 0 / # 1 / # 2 / # 3 / # 4 / # 5 / # 6 are all DL symbols / all DL symbols / 10 DL symbols + 4 unknown symbols / all unknown symbols / all UL by semi-static DL / UL settings. When set as Symbol / All UL Symbol / All UL Symbol, slot # 3 / # 4 / # 5 / # 6 can be determined to be the long PUCCH transmission slot of the multislot.

(Step 2)

Next, the second step (step 2) of determining the slot for multi-slot long PUCCH transmission is the semi-static DL / UL setting (or group common-PDCCH) when the dynamic SFI (or group common-PDCCH) is set. Signaling the DL / unknown / UL area to a symbol (or slot) set as unknown by semi-static DL / UL connection (or when semi-static DL / UL connection is not set). Can be done.

That is, among the slots in which the dynamic SFI is set and determined to be used for multi-slot long PUCCH transmission in Step 1 (particularly, among the slots set to unknown by the semi-static DL / UL configuration), the dynamic SFI is set. If K UL symbols from symbol # K1 are not set to UL (and / or unknown) for the specified slot, long PUCCH transmission may not be performed for the slot.

Further, although dynamic SFI is set, dynamic SFI information is received for the slot determined in Step 1 for multi-slot long PUCCH transmission (particularly, the slot set as unknown by semi-static DL / UL configuration). If not, long PUCCH transmission may not be performed for the slot, and a rule may be set so that long PUCCH transmission is performed for the slot.

At this time, in the case of a multi-slot long PUCCH (or a multi-slot PUSCH (multi-slot PUSCH)) instructed by dynamic L1 signaling (for example, DL assert, UL grant) or the like, Step 2 A multi-slot long PUCCH (or multi-slot PUSCH) transmission can be performed between N slots by applying only Step 1 without the application of.

Then, in the case of a multi-slot long PUCCH (for example, scheduling request, periodic CSI transmission or multi-slot PUSCH) indicated by RRC signaling (or a combination of RRC signaling and DCI, for example, transmission of semi-persistent). By applying all Step 1 and Step 2, multi-slot long PUCCH (or multi-slot PUSCH) transmission can be omitted in some of the N slots.

Alternatively, in UCI transmission, regardless of the triggering means (whether it is L1 signaling or RRC signaling), only Step 1 is always applied without applying Step 2, and multi-slot long is applied between N slots. PUCCH transmission can be performed.

More specifically, in the UCI-free (multi-slot) data transmission, the step 1 and step 2 are all applied, and the (multi-slot) PUSCH transmission is omitted in some of the N slots. Can be done.

The multi-slot long PUCCH transmission operation in the Dynamic TDD situation can be similarly applied to a multi-slot PUSCH transmission operation in which the PUSCH is transmitted over a plurality of slots for uplink coverage expansion.

Multi-slot PDSCH reception operation in Dynamic TDD situation

Further, the multi-slot long PUCCH transmission operation can also be applied to multi-slot PSCH transmission in which PDSCH is transmitted over a plurality of slots for downlink coverage expansion as follows.

(Option 1-1)

The first slot of the multi-slot PDSCH is transmitted in the slot designated as the start slot (regardless of DL or unknown), and the subsequent (N-1) slots are semi-static SFI (or dynamic SFI). It is transmitted only in the slot set as DL by.

Further, the subsequent (N-1) slots are transmitted only in the slots set as DL by semi-static SFI, or are additionally DL by dynamic SFI with the slots set as DL by semi-static SFI. It may also be transmitted to the slot set as.

(Option 1-2)

The first slot of the multi-slot PDSCH is transmitted in the slot designated as the start slot (regardless of DL or unknown), and thereafter (N-1) slots are subjected to semi-static SFI (or dynamic SFI). It transmits only in the slot set as DL or unknown.

Further, thereafter, (N-1) slots are transmitted only in the slots set as DL by semi-static SFI, or are additionally called DL by dynamic SFI with the slots set as DL by semi-static SFI. It may also be transmitted to the set slot.

However, in the above, the first slot transmission may be effective only when the starting slot is set to unknown or DL by semi-static SFI (or dynamic SFI).

However, in the above, the meaning that the specific slot is set as DL may mean that all the symbols or most of the symbols of the PDSCH transmission section in the slot are set as DL.

Alternatively, in the above, the meaning that a specific slot is set as DL means that the number of downlink symbols that can be used for PDSCH transmission in the slot is larger than or equal to the configured PDSCH interval (in symbols). It can be a limiting meaning.

In this case, if the number of downlink symbols that can be used for PDSCH transmission in the slot is smaller than the configured PDSCH interval (in symbols), it may be determined that the slot is not DL or unknown and the slot may operate. can.

When DL / UL / unknown / reserved is set in symbol units (configure), the number of downlink symbols counts only DL symbols or includes DL symbols and unknown symbols. obtain.

Further, when a part of the PDSCH section (in-symbols) set for PDSCH transmission in the slot is not a DL symbol, it can be determined that the slot is not DL or unknown and the operation can be performed.

For example, when the difference between the PDSCH section (in symbols) set for PDSCH transmission in the slot and the DL symbol exceeds one symbol, the slot can be determined not to be DL or unknown and can be operated. ..

Alternatively, when the start slot is not set to DL by semi-static SFI (or dynamic SFI), or DL or unknown, it can operate in the following manner.

(Option 2-1)

The multi-slot PDSCH is transmitted only in the N slots set as DL by the semi-static SFI (or dynamic SFI) among the subsequent slots including the start slot and the designated slot.

In addition, transmission is performed only in the subsequent slots including the start slot and the designated slot, which are set as DL by semi-static SFI, or additionally dynamic with the slot set as DL by semi-static SFI. It may also be transmitted to a slot set as DL by SFI.

(Option 2-2)

The multi-slot PDSCH is transmitted only in the N slots set as DL or unknown by semi-static SFI (or dynamic SFI) among the subsequent slots including the start slot and the designated slot.

In addition, transmission is performed only in the subsequent slots including the start slot and the designated slot, which are set as DL by semi-static SFI, or additionally dynamic with the slot set as DL by semi-static SFI. It may also be transmitted to a slot set as DL by SFI.

However, the meaning that the specific slot is set as DL means that all the symbols or most of the symbols of the PDSCH transmission section in the slot are set as DL.

Alternatively, the meaning that the specific slot is set to DL is limited to the case where the number of downlink symbols that can be used for PDSCH transmission in the slot is larger than or equal to the configured PDSCH interval (in symbols). Can be.

In this case, if the number of downlink symbols that can be used for PDSCH transmission in the slot is smaller than the configured PDSCH interval (in symbols), it may be determined that the slot is not DL or unknown and the slot may operate. can.

When DL / UL / unknown / reserved is set in symbol units (configure), the number of downlink symbols counts only DL symbols, or includes DL symbols and unknown symbols. It can be a thing.

Further, when a part of the PDSCH sections (in symbols) set for PDSCH transmission in the slot is not a DL symbol, it can be determined that the slot is not DL or unknown and can operate. ..

For example, when the difference between the PDSCH section (in symbols) set for PDSCH transmission in the slot and the DL symbol exceeds one symbol, the slot can be determined not to be DL or unknown and can be operated. ..

At this time, it can be set semi-statically (semi-static) or dynamically (dynamic) so as to operate with one of the above options.

As an example, which of the four options is applied via DCI scheduling PDSCH, which of the options 1-1 and 1-2 is applied, or the option 2-1 and It is possible to dynamically (dynamically) indicate which method of 2-2 is to be applied.

The multi-slot PSCH can omit PDSCH transmission for slots set to UL and / or reserved by semi-static SFI (or dynamic SFI).

The omitted slots may or may not be counted as one of the N slots assigned for PDSCH transmission.

The PDSCH transmission may mean a PDSCH reception operation from the standpoint of the UE.

Further, the multi-slot PDCCH reception operation in the Dynamic TDD situation can be similarly applied to the multi-slot PDCCH transmission operation in which the PDCCH is transmitted over a plurality of slots for downlink coverage expansion.

Multi-slot long PUCCH frequency hopping operation in Dynamic TDD situations

When the PUCCH is repeatedly transmitted over a plurality of slots to improve the coverage of the PUCCH, the frequency hopping (inter) between the slots is obtained in order to obtain an additional frequency diversity gain in addition to the repetition gain. -Slot frequency hopping) can be applied.

Frequency hopping between slots (inter-slot frequency hopping) means the operation of changing the position of the transmission frequency resource for each slot in order to acquire frequency diversity.

Such inter-slot frequency hopping can be performed by a random frequency hopping method and a deterministic method.

The random frequency hopping method is to generate a frequency hopping pattern for each slot by a random number generator.

Further, the deterministic frequency hopping method can be realized by, for example, a method in which a large number of frequency positions are determined so as to move to one of the frequency positions determined for each slot.

As a simple example, f1 and f2 can be made to alternate between f1 and f2 for each slot after the frequency resources of f1 and f2 are configured in the upper layer and / or L1 signaling. ..

At this time, the frequency hopping pattern of inter-slot frequency hopping can be defined by the function of the slot index.

Therefore, in the present specification, the inter-slot frequency hopping method is proposed below.

This is in consideration of the fact that in dynamic TDD, the slots capable of PUCCH transmission are limited, and the slots can be changed semi-statically or dynamically.

First, the meaning that the specific slot is set to UL in the following proposal follows the definition of Section 3.5 (multi-slot long PUCCH transmission operation in Dynamic TDD situation).

Further, in the following, the meaning of omitting the PUCCH transmission (skip) means that the PUCCH is regarded as being transmitted and is counted as the number of long PUCCH transmissions of the multi-slot.

Further, in the following, the meaning of holding (hold or defer) PUCCH transmission means that the PUCCH transmission is not counted as the number of long PUCCH transmissions of the multi-slot.

(Method 1)

A new frequency hopping pattern is generated for each slot index and ns.

Here, slot index and ns mean an index to be counted regardless of the slot format (UL / DL / unknown / reserved).

In the case of method 1, PUCCH transmission is omitted (skip) or hold (hold or defer) for slots that are not set to UL, but frequency hopping patterns are generated regardless of the slot format, but , The application in the slot is omitted (skip).

That is, the frequency hopping pattern is continuously generated in all slots, but the generated value is not applied to the actual frequency hopping.

After that, when PUCCH transmission is restarted in the slot set to UL, the newly generated frequency hopping pattern value is applied using the slot index.

In the case of the method 1, to give the example of the f1 and f2 frequency hopping described above, when only the even or odd slots are set to UL, the PUCCH is transmitted only by the f1 or f2 value, and the frequency diversity gain is increased. In some cases, it may not be obtained sufficiently.

(Method 2)

This is a method of generating a new frequency hopping pattern for each UL slot index.

Here, UL slot index and ns_u mean an index (index) that counts only the slots set as UL.

In the method 2, the UL slot index does not increase when the PUCCH transmission is omitted or held (hold or defer) for the slot not set to UL, so that a frequency hopping pattern is generated. Are also held (hold or defer).

The differences between Method 1 and Method 2 are as follows.

For example, in the case of the method 2, the f1 and f2 frequency hopping are all in order to maintain the frequency hopping pattern of the form f1 → f2 → f1 → f2 → ... even when only even or odd slots are set as UL. The frequency diversity gain can be obtained in the same manner as when the slot of is set to UL.

(Method 3)

It is a method of generating a frequency hopping pattern based on a UL slot index based on a semi-static slot format configuration.

Here, UL slot index and ns_u_ss mean an index that counts only the slots set as UL by the semi-static slot format configuration.

In the case of method 3, after the frequency hopping pattern is generated as in method 2 based on spread spectrum UL / DL configuration, a part of the slot already set as UL is changed to DL by dynamic SFI (when the slot is changed to DL (Dynamic SFI). For example, when the unknown slot capable of UL transmission is designated by DCI for DL transmission), the application of the frequency hopping pattern is omitted.

FIG. 5 is a flowchart showing an example of an operation method of a terminal for transmitting a multi-slot-based long PUCCH proposed in the present specification.

First, the terminal receives the first information regarding the TDD (time division duplex) UL (uplink) -DL (downlink) slot setting (configuration) from the base station (S510).

Then, the terminal receives the second information from the base station including the first parameter indicating the number of slots used for PUCCH transmission and the second parameter indicating the PUCCH symbol interval (duration) in the PUCCH slot (S520). ).

Then, the terminal determines a slot for transmitting the plurality of slot-based long PUCCHs based on the first information and the second information (S530).

The number of slots for transmitting the plurality of slot-based long PUCCHs can be determined by a specific number of slots from the set start slot.

The particular number of slots can consist of UL slots or unknown slots. Alternatively, the particular number of slots may include UL slots or unknown slots.

The UL slot may mean a slot in which the number of UL symbols available for PUCCH transmission in the slot is greater than or equal to the second parameter.

Then, the terminal transmits the plurality of slot-based long PUCCHs to the base station on the determined slot (S540).

If the number of UL symbols available for PUCCH transmission in a particular slot in the determined slot is less than the second parameter, then the plurality of slot-based long PUCCHs on the particular slot shall not be transmitted. There is also.

In addition, the terminal can receive a slot format indicator (SFI) from the base station to inform the specific TDD UL-DL slot format after the S510 step.

Then, the plurality of slot-based long PUCCHs can be transmitted by using a pre-DFT (discrete Fourier transform) OCC (orthogonal cover code).

More specifically, the plurality of slot-based long PUCCH resources pair the OCC associated with the UCI (uplink control information) part with the cyclic shift (CS) associated with the reference signal. Can be decided.

With reference to FIGS. 5 and 7 to 10, the contents of the multi-slot-based long PUCCH transmission proposed in the present specification will be described in the terminal device.

In a wireless communication system, a terminal that transmits a long PUCCH (physical uplink control channel) based on a plurality of slots (multi-slot) is functionally equipped with an RF (Radio Frequency) module for transmitting and receiving radio signals and the RF module. Including with the attached processor.

First, the processor of the terminal controls the RF module so as to receive the first information regarding the TDD (time division duplex) UL (uplink) -DL (downlink) slot setting (connection) from the base station.

Then, the processor receives second information from the base station including a first parameter indicating the number of slots used for transmission of the PUCCH and a second parameter indicating a PUCCH symbol (symbol) section (turbation) in the PUCCH slot. The RF module is controlled to receive.

Then, the processor determines a slot for transmitting the plurality of slot-based long PUCCHs based on the first information and the second information.

The number of slots for transmitting the plurality of slot-based long PUCCHs can be determined by a specific number of slots from the set start slot.

The particular number of slots can consist of UL slots or unknown slots. Alternatively, the particular number of slots may include UL slots or unknown slots.

The UL slot may mean a slot in which the number of UL symbols available for PUCCH transmission in the slot is greater than or equal to the second parameter.

The processor then controls the RF module to transmit the plurality of slot-based long PUCCHs to the base station on the determined slot.

If the number of UL symbols available for PUCCH transmission in a particular slot in the determined slot is less than the second parameter, then the plurality of slot-based long PUCCHs on the particular slot shall not be transmitted. There is also.

Additionally, the processor can control the RF module to receive a slot format indicator (SFI) from the base station to signal a particular TDD UL-DL slot format.

Then, the plurality of slot-based long PUCCHs can be transmitted by using a pre-DFT (discrete Fourier transform) OCC (orthogonal cover code).

More specifically, the plurality of slot-based long PUCCH resources pair the OCC associated with the UCI (uplink control information) part with the cyclic shift (CS) associated with the reference signal. Can be determined.

FIG. 6 is a flowchart showing an example of an operation method of a base station for receiving a multi-slot-based long PUCCH proposed in the present specification.

First, the base station transmits the first information regarding the TDD (time division duplex) UL (uplink) -DL (downlink) slot setting (connection) to the terminal (S610).

Then, the base station transmits the second information including the first parameter indicating the number of slots used for the transmission of the PUCCH and the second parameter indicating the PUCCH symbol (symbol) section (duration) in the PUCCH slot to the terminal. (S620).

Then, the base station receives the long PUCCH from the terminal on the plurality of slots (S630).

The plurality of slots can be determined by a specific number of slots from the set start slot.

The particular number of slots can consist of UL slots or unknown slots. Alternatively, the particular number of slots may include UL slots or unknown slots.

The UL slot may mean a slot in which the number of UL symbols available for PUCCH transmission in the slot is greater than or equal to the second parameter.

If the number of UL symbols available for PUCCH transmission in a particular slot in a plurality of slots is less than the second parameter, the long PUCCH may not be received on the particular slot.

In addition, the base station can transmit a slot format indicator (SFI) for notifying the format of the specific TDD UL-DL slot to the terminal after the S610 step.

Then, the long PUCCH can be received by using a pre-DFT (discrete Fourier transform) OCC (orthogonal cover code).

More specifically, the long PUCCH resource can be determined by pairing the OCC associated with the UCI (uplink control information) part with the CS (cyclic shift) associated with the reference signal.

The contents that the reception of the multi-slot-based long PUCCH proposed in the present specification is realized in the base station apparatus will be described with reference to FIGS. 6 to 10.

In a wireless communication system, a base station that receives a long PUCCH (physical uplink control channel) based on a plurality of slots (multi-slot) has an RF (radio frequency) module for transmitting and receiving radio signals, and the RF module and functions thereof. Including the processor connected to the target.

First, the processor of the base station controls the RF module to transmit the first information regarding the TDD (time division duplex) UL (uplink) -DL (downlink) slot setting (connection) to the terminal.

Then, the processor transmits the second information including the first parameter indicating the number of slots used for PUCCH transmission and the second parameter indicating the PUCCH symbol (symbol) section (turbation) in the PUCCH slot to the terminal. The RF module is controlled in such a manner.

Then, the base station controls the RF module so as to receive the long PUCCH from the terminal on a plurality of slots.

The plurality of slots can be determined by a specific number of slots from the set start slot.

The particular number of slots can consist of UL slots or unknown slots. Alternatively, the particular number of slots may include UL slots or unknown slots.

The UL slot may mean a slot in which the number of UL symbols available for PUCCH transmission in the slot is greater than or equal to the second parameter.

If the number of UL symbols available for PUCCH transmission in a particular slot in a plurality of slots is less than the second parameter, the long PUCCH may not be received on the particular slot.

Additionally, the processor can control the RF module to transmit a slot format indicator (SFI) to inform the specific TDD UL-DL slot format to the terminal.

Then, the long PUCCH can be received by using a pre-DFT (discrete Fourier transform) OCC (orthogonal cover code).

More specifically, the long PUCCH resource can be determined by pairing the OCC associated with the UCI (uplink control information) part with the CS (cyclic shift) associated with the reference signal.

The methods described above can be performed independently, or by various combinations or combinations of the methods, to perform the multi-slot-based log PUCCH transmission / reception proposed herein.

General equipment to which the present invention can be applied

FIG. 7 illustrates a block configuration diagram of a wireless communication device to which the method proposed herein can be applied.

Referring to FIG. 7, the wireless communication system includes a base station 710 and a plurality of terminals 720 located within the area of the base station 710.

The base station and the terminal can also be represented by wireless devices, respectively.

The base station 710 includes a processor 711, a memory 712, and an RF module (radio frequency module) 713.

The processor 711 realizes the functions, processes and / or methods proposed in FIGS. 1 to 6 above.

The layer of wireless interface protocol may be implemented by the processor.

The memory 712 is connected to the processor and stores various information for driving the processor.

The RF module 713 is connected to a processor to transmit and / or receive radio signals.

The terminal 720 includes a processor 721, a memory 722 and an RF module 723.

The processor 721 realizes the functions, processes and / or methods proposed in FIGS. 1 to 6 above.

The layer of wireless interface protocol may be implemented by the processor.

The memory 722 is connected to the processor and stores various information for driving the processor.

The RF module 723 is connected to a processor to transmit and / or receive radio signals.

The memory 712, 722 is located inside or outside the processor 711, 721 and is connected to the processor 711, 721 by various well-known means.

Further, the base station 710 and / or the terminal 720 can have one antenna (single antenna) or a multiple antenna (multiple antenna).

FIG. 8 illustrates a block configuration diagram of a communication device according to an embodiment of the present invention.

In particular, FIG. 8 is a diagram illustrating the terminal of FIG. 7 in more detail.

Referring to FIG. 8, the terminal is a processor (or digital signal processor (DSP)) 810, an RF module (RF model) (or RF unit) 835, a power management module (power management model) 805, and the like. Antenna (antenna) 840, battery (battery) 855, display (display) 815, keypad (keypad) 820, memory (memory) 830, SIM (Subscriber Identity Module) card 825 (this configuration is selective), speaker. (Speaker) 845 and microphone (microphone) 850 are included. The terminal can also include a single antenna or multiple antennas.

The processor 810 realizes the functions, processes and / or methods proposed in FIGS. 1 to 6 above. The layer of wireless interface protocol may be implemented by the processor.

The memory 830 is connected to the processor and stores information about the operation of the processor. The memory is located inside or outside the processor and is connected to the processor by various well-known means.

The user inputs instruction information such as a telephone number by, for example, pressing (or touching) a button on the keypad 820 or voice-driving using a microphone 850. The processor receives these instruction information and processes it so as to perform an appropriate function such as making a call to a telephone number. The driving data (operational data) can be extracted from the SIM card 825 or memory. In addition, the processor can display instruction information or drive information on the display 815 for the user's recognition and convenience.

The RF module 835 is connected to a processor to transmit and / or receive RF signals. In order to initiate communication, the processor transmits instruction information to the RF module, for example, to transmit a radio signal constituting voice communication data. The RF module is composed of a receiver and a transmitter for receiving and transmitting a radio signal. The antenna 840 functions to transmit and receive radio signals. When receiving a radio signal, the RF module can transmit the signal for processing by the processor and convert the signal to baseband. The processed signal can be converted into audible or readable information output via the speaker 845.

FIG. 9 is a diagram showing an example of an RF module of a wireless communication device to which the method proposed in the present specification can be applied.

Specifically, FIG. 9 shows an example of an RF module that can be realized in an FDD (Frequency Division Duplex) system.

First, in the transmission path, the processor described in FIGS. 7 and 8 processes the data to be transmitted and provides an analog output signal to the transmitter 910.

Within the transmitter 910, the analog output signal is filtered by a Low Pass Filter (LPF) 911 to remove the image generated by the digital-to-analog conversion (ADC) and by an upconverter (Mixer) 912. It is up-converted from the base band to RF, amplified by a variable gain amplifier (VGA) 913, and the amplified signal is filtered by a filter 914, further amplified by a power amplifier (PA) 915, and duplicated. (E) 950 / Antenna switch (E.) Routed via 960 and transmitted via antenna 970.

Further, in the reception path, the antenna 970 receives a signal from the outside and provides a received signal, and this signal is routed via the antenna switch (or others) 960 / duplexer 950 and provided to the receiver 920. To.

In the receiver 920, the received signal is amplified by a low noise amplifier (LNA) 923, filtered by a bandpass filter 924, and downconverted from RF to baseband by a downconverter (Mixer) 925. To.

The down-converted signal is filtered by a low pass filter (LPF) 926 and amplified by VGA 927 to obtain an analog input signal, which is provided to the processor described in FIGS. 7 and 8.

Further, the local oscillator LO generator 940 generates transmission and reception LO signals and provides them to the up converter 912 and the down converter 925, respectively.

The Phase Locked Loop (PLL) 930 also receives control information from the processor to generate transmit and receive LO signals at the appropriate frequency and provides the control signal to the LO generator 940.

Further, the circuits shown in FIG. 9 may be arranged differently from the configuration shown in FIG.

FIG. 10 is a diagram showing another example of an RF module of a wireless communication device to which the method proposed herein can be applied.

Specifically, FIG. 10 shows an example of an RF module that can be realized in a TDD (time division duplex) system.

The RF module transmitter 1010 and receiver 1020 in the TDD system have the same structure as the RF module transmitter and receiver in the FDD system.

Hereinafter, the RF module of the TDD system will be described only with a structure different from that of the RF module of the FDD system, and the description of FIG. 9 will be referred to for the same structure.

The signal amplified by the power amplifier (PA) 1015 of the transmitter is routed through a band selection switch (Band Select Switch) 1050, a bandpass filter (BPF) 1060 and an antenna switch (or others) 1070, and is an antenna. It is transmitted via 1080.

Further, in the reception path, the antenna 1080 receives a signal from the outside and provides a received signal, and this signal is routed via an antenna switch (or others) 1050, a bandpass filter 1060, and a band selection switch 1050. , Provided to receiver 1020.

The embodiments described above are those in which the components and features of the present invention are combined into a predetermined embodiment. Each component or feature shall be considered selective unless otherwise explicitly stated. Each component or feature can be implemented in a form that is not combined with other components or features. It is also possible to combine some components and / or features to form an embodiment of the present invention. The order of operations described in the embodiments of the present invention can be changed. Some configurations or features of one embodiment may be included in other embodiments or may be replaced with corresponding configurations or features of other embodiments. It is self-evident that claims that are not explicitly cited in the claims can be combined to form an embodiment or can be included in a new claim by post-application amendment.

The embodiments according to the present invention can be realized by various means such as hardware, firmware, software, or a combination thereof. In the case of hardware realization, one embodiment of the present invention includes one or more ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signal processing devices), PLDs (programmable logic devices), It can be realized by FPGAs (field programmable gate arrays), processors, controllers, microprocessors, microprocessors, and the like.

In the case of realization by firmware or software, one embodiment of the present invention can be realized in the form of modules, procedures, functions, etc. that perform the functions or operations described above. The software code is stored in memory and can be driven by the processor. The memory is located inside or outside the processor and can exchange data with the processor by various means already known.

It is obvious to ordinary engineers that the present invention can be embodied in other specific forms without departing from the essential features of the present invention. Therefore, the detailed description described above should not be analyzed in a restrictive manner in all respects and should be considered as exemplary. The scope of the invention must be determined by reasonable analysis of the appended claims, and all modifications within the equivalent scope of the invention are within the scope of the invention.

Although the present invention has mainly described an example applied to a 3GPP LTE / LTE-A / NR system, it can be applied to various wireless communication systems other than the 3GPP LTE / LTE-A / NR system. ..

Claims (18)

In a wireless communication system, a method in which a terminal (UE) transmits a long PUCCH using a plurality of slots.
The step of receiving the first information for the TDD uplink (UL) -downlink (DL) slot setting from the base station, and
Second information, including a first parameter for the number of slots used for transmission of the long PUCCH and a second parameter for the number of symbols used for transmission of the long PUCCH in one slot. Steps to receive from the base station and
A step of determining the plurality of slots for transmitting the long PUCCH based on the first information and the second information, and
A step of transmitting the long PUCCH to the base station on the plurality of slots,
Including
The long PUCCH is transmitted based on the quadrature code and
The second information further includes a third parameter for the length of the orthogonal code for the long PUCCH.
The length of the orthogonal cord is 2 or 4, and is
Based on the length of the orthogonal code being 2.
Orthogonal code index 0 corresponds to cyclic shift (CS) index 0 and
Orthogonal code index 1 corresponds to CS index 6 and
Based on the length of the orthogonal code being 4,
Orthogonal code index 0 corresponds to CS index 0 and
The orthogonal code index 3 corresponds to the CS index 9 . The method according to claim 1, wherein the plurality of slots are determined as a specific number of slots from a set start slot. The method of claim 2, wherein the particular number of slots is composed of a UL symbol or an unknown symbol. The method of claim 3, wherein the number of UL symbols available for transmission of the long PUCCH within each of the plurality of slots is greater than or equal to the second parameter. Claim that the long PUCCH is not transmitted on the particular slot based on the fact that the number of UL symbols available for transmission of the long PUCCH in the particular slot of the plurality of slots is smaller than the second parameter. The method according to 1. The method of claim 1 , comprising receiving a slot format indicator (SFI) from the base station to provide notification of a particular TDD UL-DL slot format. The method of claim 1, wherein a slot in which the number of symbols available for the long PUCCH transmission is less than the number of symbols according to the second parameter is not counted as a slot for the long PUCCH transmission . The long PUCCH is transmitted based on frequency hopping between slots.
Frequency hopping patterns are applied differently for each slot index,
The method according to claim 1 , wherein the slot index is an index counted based on the uplink slot . A terminal (UE) configured to transmit a long PUCCH using a plurality of slots in a wireless communication system.
At least one transmitter / receiver for transmitting / receiving wireless signals,
Includes at least one processor functionally connected to the at least one transmitter / receiver .
The at least one processor
The first information for the TDD uplink (UL) -downlink (DL) slot setting is received from the base station and
Second information, including a first parameter for the number of slots used for transmission of the long PUCCH and a second parameter for the number of symbols used for transmission of the long PUCCH in one slot. Received from the base station
Based on the first information and the second information, the plurality of slots for transmitting the long PUCCH are determined.
The long PUCCH is configured to be transmitted to the base station on the plurality of slots.
The long PUCCH is transmitted based on the quadrature code and
The second information further includes a third parameter for the length of the orthogonal code for the long PUCCH.
The length of the orthogonal cord is 2 or 4, and is
Based on the length of the orthogonal code being 2.
Orthogonal code index 0 corresponds to cyclic shift (CS) index 0 and
Orthogonal code index 1 corresponds to CS index 6 and
Based on the length of the orthogonal code being 4,
Orthogonal code index 0 corresponds to CS index 0 and
The orthogonal code index 3 is a terminal corresponding to the CS index 9 . The terminal according to claim 9 , wherein the plurality of slots are determined as a specific number of slots from a set start slot. The terminal according to claim 10 , wherein the specific number of slots is composed of a UL symbol or an unknown symbol. 11. The terminal of claim 11 , wherein the number of UL symbols available for transmission of the long PUCCH within each of the plurality of slots is greater than or equal to the second parameter. The at least one processor has said long on the particular slot based on the fact that the number of UL symbols available for transmission of the long PUCCH in the particular slot of the plurality of slots is less than the second parameter. The terminal according to claim 9 , which is configured not to transmit a PUCCH. The terminal of claim 9 , wherein the at least one processor is configured to receive a slot format indicator (SFI) from the base station to provide notification of a particular TDD UL-DL slot format. The terminal according to claim 9 , wherein a slot in which the number of symbols available for the long PUCCH transmission is smaller than the number of symbols according to the second parameter is not counted as a slot for the long PUCCH transmission . The long PUCCH is transmitted based on frequency hopping between slots.
Frequency hopping patterns are applied differently for each slot index,
The terminal according to claim 9 , wherein the slot index is an index counted based on the uplink slot . A processing device configured to control a terminal (UE) to transmit a long PUCCH using a plurality of slots in a wireless communication system.
With at least one processor
Includes at least one computer memory functionally connected to the at least one processor.
When the at least one computer memory is executed by the at least one processor,
The first information for the TDD uplink (UL) -downlink (DL) slot setting is received from the base station and
Second information, including a first parameter for the number of slots used for transmission of the long PUCCH and a second parameter for the number of symbols used for transmission of the long PUCCH in one slot. Received from the base station
Based on the first information and the second information, the plurality of slots for transmitting the long PUCCH are determined.
Stores instructions to perform operations including transmitting the long PUCCH to the base station on the plurality of slots.
The long PUCCH is transmitted based on the quadrature code and
The second information further includes a third parameter for the length of the orthogonal code for the long PUCCH.
The length of the orthogonal cord is 2 or 4, and is
Based on the length of the orthogonal code being 2.
Orthogonal code index 0 corresponds to cyclic shift (CS) index 0 and
Orthogonal code index 1 corresponds to CS index 6 and
Based on the length of the orthogonal code being 4,
Orthogonal code index 0 corresponds to CS index 0 and
The orthogonal code index 3 is a processing device corresponding to the CS index 9. A base station configured to receive a long PUCCH using a plurality of slots in a wireless communication system.
At least one transmitter / receiver for transmitting / receiving wireless signals,
Includes at least one processor functionally connected to the at least one transmitter / receiver.
The at least one processor
Sends the first information for the TDD uplink (UL) -downlink (DL) slot setting to the terminal (UE) and
Second information, including a first parameter for the number of slots used for receiving the long PUCCH and a second parameter for the number of symbols used for receiving the long PUCCH in one slot. The plurality of slots for transmitting to the terminal and receiving the long PUCCH based on the first information and the second information are determined.
The long PUCCH is configured to be received from the terminal on the plurality of slots.
The long PUCCH is received based on the quadrature code and
The second information further includes a third parameter for the length of the orthogonal code for the long PUCCH.
The length of the orthogonal cord is 2 or 4, and is
Based on the length of the orthogonal code being 2.
Orthogonal code index 0 corresponds to cyclic shift (CS) index 0 and
Orthogonal code index 1 corresponds to CS index 6 and
Based on the length of the orthogonal code being 4,
Orthogonal code index 0 corresponds to CS index 0 and
The orthogonal code index 3 is a base station corresponding to the CS index 9.

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